发明名称 |
Process for reducing fouling from flash/separation apparatus during cracking of hydrocarbon feedstocks |
摘要 |
Hydrocarbon feedstock containing resid is cracked by a process comprising: (a) heating the hydrocarbon feedstock; (b) mixing the heated hydrocarbon feedstock with steam and optionally water to form a mixture stream; (c) introducing the mixture stream to a flash/separation apparatus to form i) a vapor phase at its dew point which partially cracks and loses/or heat causing a temperature decrease and partial condensation of the vapor phase in the absence of added heat to provide coke precursors existing as uncoalesced condensate, and ii) a liquid phase; (d) removing the vapor phase as overhead and the liquid phase as bottoms from the flash/separation apparatus; (e) treating the overhead by contacting with a hydrocarbon-containing nucleating liquid substantially free of resid and comprising components boiling at a temperature of at least about 260° C. (500° F.) under conditions sufficient to at least partially coalesce the coke precursors to provide coke precursor liquid, in the form of hydrocarbon droplets or a continuous hydrocarbon liquid phase; (f) collecting and removing the droplets; (g) directing the treated overhead from which the droplets are removed, to a heater to provide a heated vapor phase; (h) cracking the heated vapor phase in a radiant section of a pyrolysis furnace to produce an effluent comprising olefins, the pyrolysis furnace comprising a radiant section and a convection section; and (i) quenching the effluent and recovering cracked product therefrom. An apparatus for carrying out the process is also provided.
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申请公布号 |
US7641870(B2) |
申请公布日期 |
2010.01.05 |
申请号 |
US20080019978 |
申请日期 |
2008.01.25 |
申请人 |
EXXONMOBIL CHEMICAL PATENTS INC. |
发明人 |
STELL RICHARD C.;VIDONIC NICHOLAS G. |
分类号 |
B01J19/00;B01D3/00;B01D3/06;B01D3/34;B01D3/38;C07C4/02;C10G7/00;C10G9/00;C10G9/20;C10G9/36 |
主分类号 |
B01J19/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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